Tim Robinson (Tim_Robinson@mksinst.com) is General Manager, MKS Spectra Products; Peter Rosenthal, Ph.D. (Peter_Rosenthal@ mksinst.com) is General Manager, MKS On-Line Products; Martin L. Spartz, Ph.D. (Martin_Spartz@mksinst.com) is Director of Technical Marketing, MKS On-Line Products, MKS Instruments, Inc, 6 Shattuck Road, Andover, MA 01810; 800-227-8766; fax, 978-975-0093. MKS is a manufacturer of instruments, components, and subsystems for vacuum- and gas-based processes.